OBD Codes

P0242

Turbo/Super Charger Boost Sensor "B" Circuit High

Moderateturbo

Overview

The P0242 code indicates a turbo/super charger boost sensor "b" circuit high condition has been detected by the PCM. This code relates to the turbocharger/supercharger system that provides forced induction to increase engine power. Issues with the boost system can result in reduced power, poor fuel economy, and potential turbocharger damage if not addressed.

Symptoms

  • Reduced engine power
  • Whining or whistling noise from turbo
  • Turbo lag or surging
  • Poor acceleration

Common Causes

  • Boost leak in intercooler piping
  • Clogged air filter restricting airflow
  • Faulty turbocharger wastegate
  • Faulty wastegate control solenoid

Diagnosis Steps

  1. 1Connect an OBD-II scanner and read all stored trouble codes and freeze frame data
  2. 2Inspect all boost hoses and intercooler piping for leaks or disconnections
  3. 3Test the boost pressure sensor with a multimeter or scan tool live data
  4. 4Check the wastegate and bypass valve for proper operation
  5. 5Inspect the turbocharger for shaft play, oil leaks, or damage

Estimated Repair Cost

$200$3,000

Cost varies by vehicle, location, and repair shop. Includes parts and labor.

Commonly Affected Vehicles

Mercedes-Benz CLAMini Cooper SHyundai Veloster TurboChevrolet Cruze Turbo

Related Codes

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Frequently Asked Questions

Minor turbo codes like sensor issues may allow careful driving, but significant boost or oil-related turbo codes should be addressed immediately to prevent turbocharger failure, which is very expensive to repair.